Form for continuous concrete pipe



Sept. 8, 1936. G. L. cARLsoN4 FORM FOR CONTINUOUS CONCRETE PIPE FiledSept. 4, 1935 ,Q Sheets-Sheet l Invenlor @KX w A A Homey By QM Sept. 8,1936. G. CARLSON 2,053,814

FORM FOR CONTINUOUS CONCRETE PIPE Filed Sept. 4, 1935 Sheet 2 2 SheetsHomey Patented Sept. 8, 1936 UNITED STATES maaar orrlca ApplicationSeptember 2 Claims.

This invention relates to a form for constructing the upper half of acontinuous concrete pipe, the general object of the invention being toso construct the form that it can be readily removed from one end of thepipe or a completed section thereof from the exterior of the pipe andwithout necessitating the workmen crawling into the pipe, thuspermitting the pipe to be constructed of such diameter as to be too.small for a workman to enter the same.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts to behereinafter fully described, illustrated in the accompanying drawingsand specically pointed out in the appended claims.

Figure l is a longitudinal view showing the improved form in position ina lower half of a concrete pipe ready to receive the concrete for theupper half.

Figure 2 is a vertical sectional view through that section of the formwhich is located at the completed end of the pipe.

Figure 3 is a section on line 3-3 of Figure 2.

Figure 4 is a section on line 4--4 of Figure 2.

Figure 5 is a section on line 5-5 of Figure 2.

Figure 6 is a View of the hook.

In these drawings, the numeral I indicates a plurality of form sections,each of which is substantially of semi-circular form in cross-sectionand has a reduced lip forming part 2 at one end for receiving theadjacent end of the next section so that when the sections are placedtogether, they will form a, continuous and unbroken exterior surface forthe concrete, it being understood that these forms are used forcompleting the upper half of a concrete pipe, as shown in Figure 1. Eachsection I has la sectional cross-bar 6 adjacent each end thereof, theinner end of the two sections being pivoted together as shown at l, andtheir outer ends are pivoted to the inward iianges 8 of the sections asshown in Figure 4, at 9.

A longitudinally extending bar I connects each pair of cross-bars 6together and the ends of the bar El) may be connected with thecross-bars by the pivots l. An upright I I is placed in the frontportion of each section and is formed of two sections adjustablyconnected together as shown at I2 so that the length of the upright canbe adjusted and the upper portion of the lower section is pivoted to thefront end of a bar I0 as shown at I3. A shoe I4 is pivoted to the lowerend of each upright and rests upon the bottom of the lower half of thepipe as shown in Figure 1. The upper end of the upright is bentrearwardly and passes 4, 1935, Serial No. 39,169

through an eye I6 depending from the top of the section.

An upright it is placed at the rear end of the last section and is alsoadjustable as to its length as shown at I9 and the upper end of thisupright is pivoted or hinged to the top of the rear section, as shown at26. This upright also has a shoe 2| at its lower end for resting on thebottom of the completed half construction of the pipe andr a pulley 22is carried by the forwardly extending ears 23 of the upper portion ofthe upright.

As will be understood, when the cross-pieces 6 are straight the formwill be held expanded and will be supported in this position by theuprights and in position to receive the concrete for the upper half ofthe pipe.

A cable 24 is passed around the pulley 22 with both ends of the cableextending from the outermost form section, as shown in Figure 1 and oneend of the cable has a snap hook 25 attached thereto for engagement witha hook 26 to which a sec- .ond cable 2'I is connected. These parts arearranged as shown in Figure 1 and after the concrete has formed theupper half of a pipe or a section thereof, and it is desired to removethe form sections, the lower part of the cable 24 is pulled upon so thatthe hook 26, which is formed as shown in Figure 6, will pass through theopening 28 formed in the upper part of the upright I I, Then the cable2l is pulled upon, which will cause the hook to catch in the wall of theeye 28 and thus the first upright II will be pulled forwardly to removethe part I out of the eye I6 and also to exert a pull upon the bar I6which will break the cross-pieces 6 of the outer section so that suchsection will contract and thus this section can be removed from thepipe. After this is done, the cable is again pulled upon to place thehook 26 in engagement with the front upright of the next section and thecable 2l is pulled upon to pull this section out of the pipe and thisoperation is continued until all the sections have been pulled from thepipe, the upright I8 swinging on the hinge 20 when both parts of thecable 24 are pulled upon so that it will be removed with the last formsection.

Thus it will be seen that with this invention, pipes can be constructedof such a diameter that would be too small for a workman to enter thesame and as far as I am aware concrete pipes have not hitherto beenformed in the place they are to occupy, of a less diameter than thatwhich will permit a workman to enter the pipe to remove the form.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction andin the combination and arrangement of the several parts provided thatsuch changes fall within the scope of the appended claims.

What is claimed is:

l. A form for the upper half of a. concrete pipe, comprising a pluralityof sections, cross b'ars in each section adjacent the ends thereof, eachcross bar being formed of two sections having their inner ends pivotedtogether and their outer ends pivoted to parts of the sections, alongitudinally extending bar connecting the pivot point of each pair ofcross bars together, an upright at the front end of each section towhich the front end of the longitudinally extending bar is pivoted, apulley carrying member pivotally connected at its upper end with therear end of the rear section and having a pulley thereon, eyes formed inthe uprights, a cable having a hook connected therewith passing throughthe eyes and over the pulley, both ends of the cable extending from theouter end of the pipe, said hook being constructed and arranged topermit the same to pass through the eye when the lower flight of thecable is pulled and to prevent the hook from returning through the eyewhen the upper flight is pulled.

2. A form for the upper half of a concrete pipe, comprising a pluralityof sections, cross bars in each section adjacent the ends thereof, eachcross bar being formed of two sections having their inner ends pivotedtogether and their outer ends pivoted to parts of the sections, alongitudinally extending bar connecting the pivot point of each pair ofcross bars together, an upright at the front end of each section towhich the front end of the longitudinally extending bar is pivoted, apulley carrying member pivotally connected at its upper end with therear end of the rear section and having a pulley thereon, eyes formed inthe uprights, a cable having a hook connected therewith passing throughthe eyes and over the pulley, both ends of the cable extending from theouter end of the pipe, said hook being constructed and arranged topermit the same to pass through the eye when the lower ight of the cableis pulled and to prevent the hook from returning through the eye whenthe upper flight is pulled, said uprights and the pulley carrying memberbeing adjustable lengthwise and each having a shoe at its lower end forresting upon the bottom of the lower half of the pipe and the uprightshaving bent portions at their upper ends engaging eyes depending fromthe top parts of the form sections.

GUSTAF L. CARLSON.

